Louise Meanwell, 41, who claimed to be Cashman’s mistress, is biding time at the Hudson County Correctional Facility in Kearny, N.J., after immigration officials nabbed her to face a possible exile from the country. (Alec Tabak/for New York Daily News)

The British-born woman who admitted to blackmailing Yankees general manager Brian Cashman and is now in federal custody facing possible deportation has another pending problem — she allegedly owes her private sleuth about $6,000.

Louise Meanwell, 41, who claimed to be Cashman's mistress, is biding time at the Hudson County Correctional Facility in Kearny, N.J., after immigration officials nabbed her to face a possible exile from the country.

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Meanwell pleaded guilty in December 2015 to grand larceny, extortion, perjury and criminal impersonation and was previously convicted at trial of lying to get a government subsidized luxury apartment in Tribeca.

Before settling her case, private detective Vinny Parco and his firm did over $12,000 worth of gumshoe work on her case.

For years, she vowed to confront Cashman in court, but in the end took a jail-free plea deal offered by the judge.

Parco, star of the short-lived 2005 reality show "Parco P.I.," said he stepped up efforts to recover the needy former client's unpaid tab when he learned of her immigration pickle.

Parco's firm sent Meanwell's mother Caroline, who signed the retainer agreement, a notice on April 30 demanding the unpaid balance.

For years, Meanwell vowed to confront Cashman (pictured) in court, but in the end took a jail-free plea deal offered by the judge. (Andrew Savulich/New York Daily News)

It has been radio silence since, he said.

"I'm going to have to sue both of them," Parco said Friday.

Parco called Meanwell "a very demanding client" who "asked us to go all over the place" and "do all kinds of things."